Cedrol, widdrol, thujopsene, alpha cederene, beta cedrene, and a range of sesquiterpenes
are the key components involved in the China Cedar wood oil.
guajava fresh leaves is composed mainly by hydrocarbon sesquiterpenes
(62.0%), followed by oxygenated sesquiterpenes
(14.8%), hydrocarbons monoterpenes (1.8%), and oxygenated monoterpenes (1.2%) (Table 1).
(5) Ferula species have been found to contain sesquiterpenes
A total of 58 secondary metabolites, mainly comprising 18 esters, six monoterpene hydrocarbons, two oxygenated monoterpenes, 20 sesquiterpene
hydrocarbons, seven oxygenated sesquiterpenes
, and four ketones, were positively or tentatively identified.
These compounds were grouped into phenylpropanoids, major compounds (2.64-71.52%), sesquiterpenes
(5.40-6.38%), monoterpenes (0.17-4.04%), oxygenated monoterpenes (0.34-0.82%), and oxygenated sesquiterpenes
Aromadendrene oxide-(1) is a Sesquiterpene
oxide which are known to have different activities like anti-tumor, analgesic, antibacterial, antiinflammatory, sedative, fungicide  and the oxygenated sesquiterpenes
and flavonoids have more antioxidant activity than the non-oxygenated sesquiterpenes
It was also found that the essential oil mainly composed of oxygenated compounds 51.35-59.74% while monoterpene hydrocarbons and sesquiterpenes
constituted 38.86-47.43% and 0.36-0.6% of it, respectively.
The exception is a chemotype with phenolic compounds thymol and carvacrol as the principal constituents , and varieties with no artemisia ketone detected , and with oxygenated sesquiterpenes
as the major constituents .
Combining with DEPT NMR, the compound contains 3 quaternary carbon signals, 4 methine signals, 2 methylene signals, and 4 methyl signals, indicating the compound to be lower 2 carbon sesquiterpenes
. Thus, GB-10 is (3S, 5R, 6S)-6-((E)-3-hydroxybut-1-enyl)-1,1,5-trimethylcyclohexane-3,5,6-triol.
With the further analysis of the GS-MS results, it was found that the essential oil contained a plenty of monoterpenes and sesquiterpenes
, and their contents accounted for 27.0% and 21.3% of the essential oil, respectively.
Species of this genus are known to show monoterpenes and sesquiterpenes
, such as limonene and apinene [14,15].
Essential oils are mixtures of volatile compounds, including monoterpenes, sesquiterpenes
, and phenylpropanoids which may easily percolate through cell membranes, a great advantage in terms of interaction with intracellular targets.